What is the optimal way to implement this?

A company represents their customers as Accounts that have an External ID field called Customer_Number__c. They have a custom Order (Order__c) object, with a Lookup to Account, to represent Orders that are placed in their external order management system (OMS). When an order is fulfilled in the OMS, a REST call to Salesforce should be made that creates an Order record in Salesforce and relates it to the proper Account.

What is the optimal way to implement this?
A . Perform a REST GET on the Account and a REST POST to update the Order__c with the Account’s record I
C . Perform a REST PATCH to upsert the Order__c and specify the Account’s Customer_Number__c in it.
D . Perform a REST POST to update the Order__c and specify the Account’s Customer_Number__c in it.
E . Perform a REST GET on the Account and a REST PATCH to upsert the Order__c with the Account’s record I

View Answer

Answer: B